If things go as I hope they do, I plan on building a geodesic dome home around October. This home will be built out of steel for the frame, not wood. My questiion is, which way to go for a foundation? For a geo-dome, all you really need for a foundation is the outer circular area. Since there is no weight anywhere else to consider.
Let's say I do a four foot wide circular cement slab. What can I use in the rest of the area not cemented? This will be in northern florida.
My other option is to do a crawl space. In the steel version, standoffs are what are cemented into the ground. Then the frame is connected to them. In that case, I want to have the outer wall shaped as the dome. Then a series of inner walls for support of the floor. But how many? The maximum width of the house is 48ft. Considering using 2x12's on top of the cinder block inner walls. What's the largest span I can get away with? 8, 10 or even 12 foot?